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This Special Issue on “Polymer Membranes for Gas Separation” of the journal Membranes aims to offer an overview about the different applications and strategies available to improve the separation performances based on the material choice and the process conditions.Various topics have been discussed, including the synthesis and characterization of novel membrane materials, membrane aging, and the impact of process conditions on transport phenomena.

gas separation --- CO2 capture --- mixed-matrix membranes --- aromatic poly(imide)s --- bulky pendant groups --- gas permeability --- structure-property relationship --- polyphenylacetylene --- cis-cisoid conformation --- cis-transoid conformation --- carbamate group --- membrane-forming ability --- solubility --- oxygen permeation membrane --- graphdiyne --- molecular simulation --- membrane separation --- hydrogen purification --- polyimide membrane --- natural gas separation --- pollutant effects --- stability measurements --- facilitated transport --- fixed site carrier membrane --- polyallylamine-polyvinyl alcohol-graphene oxide membrane --- modelling --- carbon capture --- gas permeation --- composite membranes --- CO2/CH4 separation --- water and organic pollutants --- hydrophilic/hydrophobic character --- biogas upgrading --- sustainable energy --- electrochemical hydrogen separation --- electrochemical hydrogen pump --- proton exchange membrane (PEM) --- hydrogen purification/separation --- physical aging --- hyper cross-linked polymer --- 13C spin-lattice relaxation times --- SS-NMR spectroscopy --- n/a

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This Special Issue on “Polymer Membranes for Gas Separation” of the journal Membranes aims to offer an overview about the different applications and strategies available to improve the separation performances based on the material choice and the process conditions.Various topics have been discussed, including the synthesis and characterization of novel membrane materials, membrane aging, and the impact of process conditions on transport phenomena.

Technology: general issues --- Chemical engineering --- gas separation --- CO2 capture --- mixed-matrix membranes --- aromatic poly(imide)s --- bulky pendant groups --- gas permeability --- structure-property relationship --- polyphenylacetylene --- cis-cisoid conformation --- cis-transoid conformation --- carbamate group --- membrane-forming ability --- solubility --- oxygen permeation membrane --- graphdiyne --- molecular simulation --- membrane separation --- hydrogen purification --- polyimide membrane --- natural gas separation --- pollutant effects --- stability measurements --- facilitated transport --- fixed site carrier membrane --- polyallylamine-polyvinyl alcohol-graphene oxide membrane --- modelling --- carbon capture --- gas permeation --- composite membranes --- CO2/CH4 separation --- water and organic pollutants --- hydrophilic/hydrophobic character --- biogas upgrading --- sustainable energy --- electrochemical hydrogen separation --- electrochemical hydrogen pump --- proton exchange membrane (PEM) --- hydrogen purification/separation --- physical aging --- hyper cross-linked polymer --- 13C spin-lattice relaxation times --- SS-NMR spectroscopy --- n/a

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Protein adsorption to solids, nanomaterials, and biological surfaces is of central interest in many fields, including biomedicine, bioanalytical chemistry, materials engineering, bio-nanotechnology, and basic biomolecular research. Although protein adsorption may sometimes occur with little consequence on molecular structure, interactions with surfaces frequently cause changes in local or global conformations and dynamics, perturbations to secondary structures or tertiary folds, eventually resulting in dramatically altered protein function. Importantly, surfaces may trigger protein misfolding and self-aggregation, or, conversely, promote protein structure formation. The use of nanoscale surfaces to remodel the conformational landscape and the aggregation pathways of amyloidogenic peptides and proteins has been proposed as a promising strategy against several severe human diseases. The rapid growth of applications and technological innovation which is based on or concerned with protein adsorption necessitates renewed efforts to provide molecular-level insights into adsorption-induced protein structural perturbations. In this Special Issue, we gathered the recent findings of experimental and computational investigations that contributed novel insights into protein adsorption with a focus on the structural and dynamic aspects of proteins.

Research & information: general --- Biology, life sciences --- Biochemistry --- sarcoplasmic reticulum Ca2+-ATPase --- Cu+-ATPase --- phospholipid flippase --- charge displacement --- concentration jump --- solid supported membrane --- conformational transition --- electrogenicity --- ion translocation --- phospholipid flipping --- protein-nanoparticle interactions --- protein NMR --- amyloidogenic proteins --- nitroxide paramagnetic perturbation --- spin label extrinsic probes --- Tempol --- β2-microglobulin --- protein conformation --- protein-surface association --- lipid membranes --- surface-immobilized protein --- EPR spectroscopy --- alpha-synuclein --- amyloid fibrils --- conformational flexibility --- protein adsorption --- protein aggregation --- nano-bio interface --- nanocomposite --- nanoparticles --- supramolecular assembly --- NMR spectroscopy --- gold nanoparticles --- PEGylation --- adsorption --- passivation --- n/a

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Thermoresponsive polymers, materials able to undergo sharp and often reversible phase separations in response to temperature stimuli, are introducing new paradigms in different fields, including medicine, advanced separations and oil and gas. In "Advances in Thermoresponsive Polymers", a clear picture of the frontiers reached in the understanding of the mechanistic behavior associated with temperature-induced phase separation, the influence of the polymer structure in regulating the macroscopic behavior of these materials and the latest applications for which thermoresponsive polymers show great potential is provided.

Technology: general issues --- Chemical engineering --- poly(N,N-diethylacrylamide) --- glycidyl methacrylate --- thermoresponsive copolymer --- α-chymotrypsin --- polymer-enzyme conjugate nanoparticle --- polymeric nanoparticles --- emulsion polymerization --- RAFT --- thermo-responsive polymers --- smart materials --- LCST --- phase diagram --- phase separation --- thermoresponsive star-shaped polymers --- poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines --- aqueous solutions --- light scattering --- turbidimetry --- microcalorimetry --- aggregation --- dual-stimuli-responsive materials --- thin films --- out-of-equilibrium --- thermoresponsive --- oligo(ethylene glycol) --- OEGylated --- poly(amino acid) --- ring-opening polymerization --- post-polymerization modification --- Ugi reaction --- synthesis --- star-shaped macromolecules --- calix[n]arene --- block and gradient copolymers of poly-2-alkyl-2-oxazolines --- conformation --- thermoresponsibility --- self-organization --- poly-N-vinylcaprolactam --- thermoresponsive polymers --- polymer-protein conjugates --- controlled release --- temperature-sensitive polymers --- hydrogels --- stereocomplexation --- polylactic acid --- temperature/reduction --- self-recombination --- thermosensitive polymers --- enzyme complexation --- reversible inactivation --- UCST polymers --- stimuli-responsive polymers --- electronic paramagnetic resonance --- spin probe --- nitroxides --- coil to globule --- poly(L-lysine) --- N-isopropylacrylamide --- aza-Michael addition reaction --- thermo-responsive --- pH-responsive --- biodegradable polymer

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Thermoresponsive polymers, materials able to undergo sharp and often reversible phase separations in response to temperature stimuli, are introducing new paradigms in different fields, including medicine, advanced separations and oil and gas. In "Advances in Thermoresponsive Polymers", a clear picture of the frontiers reached in the understanding of the mechanistic behavior associated with temperature-induced phase separation, the influence of the polymer structure in regulating the macroscopic behavior of these materials and the latest applications for which thermoresponsive polymers show great potential is provided.

poly(N,N-diethylacrylamide) --- glycidyl methacrylate --- thermoresponsive copolymer --- α-chymotrypsin --- polymer-enzyme conjugate nanoparticle --- polymeric nanoparticles --- emulsion polymerization --- RAFT --- thermo-responsive polymers --- smart materials --- LCST --- phase diagram --- phase separation --- thermoresponsive star-shaped polymers --- poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines --- aqueous solutions --- light scattering --- turbidimetry --- microcalorimetry --- aggregation --- dual-stimuli-responsive materials --- thin films --- out-of-equilibrium --- thermoresponsive --- oligo(ethylene glycol) --- OEGylated --- poly(amino acid) --- ring-opening polymerization --- post-polymerization modification --- Ugi reaction --- synthesis --- star-shaped macromolecules --- calix[n]arene --- block and gradient copolymers of poly-2-alkyl-2-oxazolines --- conformation --- thermoresponsibility --- self-organization --- poly-N-vinylcaprolactam --- thermoresponsive polymers --- polymer-protein conjugates --- controlled release --- temperature-sensitive polymers --- hydrogels --- stereocomplexation --- polylactic acid --- temperature/reduction --- self-recombination --- thermosensitive polymers --- enzyme complexation --- reversible inactivation --- UCST polymers --- stimuli-responsive polymers --- electronic paramagnetic resonance --- spin probe --- nitroxides --- coil to globule --- poly(L-lysine) --- N-isopropylacrylamide --- aza-Michael addition reaction --- thermo-responsive --- pH-responsive --- biodegradable polymer